Splinter Cell - Gameboy Advance
Bonus levels
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Link the Game Boy Advance to the Gamecube version of
Splinter Cell to unlock five bonus levels.
Alternately, complete the normal levels in the game
with a high percentage rank (over 60%) to unlock the
various bonus levels
Unlock Bonus Mission 1
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You have to beat missions 1-5 at 60% or higher.
Unlock Bonus Mission 6
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To unlock bonus level 6 open all the safes in missions 1-9